Question

present participle in which last letter is double​

Answer 1

Answer:

Which present participles have their last letter doubled?

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Many do. Here are some examples:

Rubbing

Padding

Bragging

Humming

Running

Rapping

Warring

Batting

Revving

I think the basic rule is that you need to double the last letter if not doing so would significantly change the pronunciation (and possibly the meaning).

For example, you do not want to drop the extra p in rapping.

Explanation:

Answer 2

Sit—- sitting
When word ends with CVC i.e. Consonant Vowel Consonant , we double the last letter and add ing.